DialPlan 06:30:01:505 sip1(9588): SDP on UAC call was set to NOT mangle, RTP socket 172.16.1.101:47190.
...
DialPlan 06:30:04:459 sip1(9588): SDP on UAC response was set to NOT mangle, RTP socket 14.147.55.3:14330.

What those two lines tell you is that the the attempt will be made to set up the audio stream between sockets 172.16.1.101:47190 and 14.147.55.3:14330. The first IP address is from your private LAN and is fine for this case however the second IP address is the public IP address of your network and normally won't work properly for devices on your private LAN.

One possible way to get the second device to use its private IP address is to turn off any STUN setting or blank out the STUN server if it's set.